Patent US3668081A successfully refreshed from Google Patents.
US3668081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of electrolytic metal
Assignee: Huntington Alloys Corp
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Filing: 1971-03-17
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Granted: 1972-06-06
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Expires: 1991-03-17
Abstract
Abstract Metals such as nickel are electroformed upon a matrix or mandrel having an epoxy resist pattern thereon to provide foraminous or dividable electrodeposited metal separable from the matrix wherein the matrix is prepared by depositing from 2 to 30 microinches of standard chromium thereon and the desired resist pattern is applied to the chromium-plated surface in the form of a thermoset epoxy ink or paint containing dicyandiamide as a heat-curing agent and then heat curing the resist pattern to provide a repeatedly reuseable matrix.
Inventors
- 👤 William Gerard Borner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
23 words
The process according to claim 1 wherein the chromium deposit is removed from the conductive islands prior to the electrodeposition of nickel thereon.
Claim 2
Dependent Claim
20 words
The process according to claim 1 wherein the chromium plate has a thickness of about 2 to about 30 microinches.
Claim 3
Dependent Claim
25 words
The process according to claim 1 wherein the pattern of interconnecting areas of resist is applied to said stainless steel blanks by silk screen printing.
Claim 4
Dependent Claim
48 words
The process according to claim 1 wherein the epoxy paint comprises in parts by weight of effective ingredients, about 12 parts of epoxy resin having a viscosity at 38* C. of about 400 to 600 centipoise, up to about seven parts of pigment and one part of dicyandiamide.
Claim 5
Dependent Claim
20 words
The process according to claim 5 wherein the pigment is titanium dioxide with from 0 to 80 percent calcium carbonate.
Claim 6
Dependent Claim
19 words
The process according to claim 1 wherein the conductive islands are substantially circular and are applied in staggered rows.
Claim 7
Dependent Claim
29 words
The process according to claim 1 wherein the stainless steel cathode blank has a pickled surface and the nickel deposit contains about 0.005 percent to about 0.025 percent sulfur.
Claim 8
Dependent Claim
19 words
The process according to claim 8 wherein said nickel deposit contains about 0.01 percent to about 0.02 percent sulfur.
Claim 9
Dependent Claim
23 words
The process according to claim 1 wherein the stainless steel cathode blank has a sandblasted surface and the nickel deposit is essEntially sulfur-free.
Claim 10
Dependent Claim
90 words
In the electroforming of nickel upon a stainless steel matrix having on the surface thereof a pattern of resist material, the improvement for providing a strongly adherent pattern of said resist material upon said matrix surface which comprises chromium plating said surface, applying to said chromium plated surface a resist pattern of an epoxy-base ink containing dicyandiamide as a hardener, heat-curing said resist ink pattern and electrodepositing nickel upon said matrix bearing said cured ink pattern whereby said matrix may be employed repeatedly without damage to said cured resist pattern.
Claim 11
Dependent Claim
136 words
In the electrodeposition of a metal from the group consisting of nickel, cobalt and iron from an acid aqueous electrolyte upon a sheet-form cathode blank having a continuous pattern of non-conductive resist material applied to said blank to define conductive islands on the faces thereof and relatively heavy dividable metal deposits separable from said cathode blank are formed thereon, the improvement which comprises producing repeatedly reusable cathode blanks made of a metal from the group consisting of stainless steel, titanium, aluminum, iron and nickel by chromium plating said cathode blank, applying a film of epoxy-base paint cured by means of dicyandiamide to the resulting chromium surface and heat-curing said paint film to form said interconnecting lines of resist, whereby said epoxy-base paint film adheres strongly to said chromium plated metal cathode blank during said electrodeposition process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |